no the problem he is explainign is exactly the problem,

the second video card is not rendering on the monitor connected to it, it is being software rendered ( you can not select which video card to start a selected application on as of yet) so when you start WOW x5 it all starts on your primary video card, whwen you move it to the secondary card it doesnt automatically start rendering it. there are a few crude work arounds that you can look up though.